Question

A tennis ball of mass m strikes a massive walll with velocity v and traces the same path. Calculate the change in momentum

Answer 1

If the mass remain constant then change in momentum= Pf-Pi

If we take motion in X dirn be +be,then Pf= -mv, Pi=+mv

so change in momentum= -2mv

(-ve show the direction is in-ve X axis)

Hope it will help

Answer 2

Answer:

–2mv

Explanation:

On considering Mass & Velocity as Constant.

∆P = P $_f$ - P $_i$

P$_i$ = Ball going towards the Wall, +mv (Initial Momentum)

P$_f$ = Ball striking back towards the Initial path, m(–v) => –mv (Final Momentum)

On putting the Value,

∆P = m(-v) – mv

∆P = –mv –mv

∆P = –2mv

Hope it helps you!

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